3.1429
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21 over 66 is 21/66, and to simplify you must find to common factors of the two numbers ( the denominator and the numerator). a common one in this case is 3. 66 divided by 3= 22 and 21 divided by 3=7So the answer is 7/22 (7 over 22)
An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 66 is an even number.
66/20 = 33/10
0.2121
0.0455